io.github.j-river/mermaidonline
Mermaid Online MCP — Share Links & Source
Is the Mermaid Online MCP server down? No. It answered initialize and tools/list in the probe of 2026-11-14.
Mermaid Online MCP: encode share links and recover Mermaid diagram source locally.
alive probed 2026-11-15 · unchanged since 2026-11-14
- Run it
- npx -y mermaidonline-mcp@0.1.0 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- mermaidonline-mcp 0.1.0
- Capabilities
- tools
- Instructions
- 374 characters
- Of a 1M window
- <0.1 % of a 1M context window
- Count
- 601 tokens in Claude Opus 5.5, exact, measured 2026-11-14. With the Claude Code prefix mcp__…__ on each tool name: 623. The o200k_base estimate is 326. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/j-river/mermaidonline-mcp
- Website
- https://mermaidonline.org/
- Registry
- active, updated 2026-11-14 · registry entry
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.84×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| encode_mermaid_share | 332 | 180 | 55 % |
| decode_mermaid_share | 269 | 146 | 45 % |
Compare this server with others.
More servers
Other registry entries on npmjs.com, the ones next to this name; all of them.
- GuildControl MCP io.github.j-256/guildcontrol · needs args
- io.github.j-east/pixel-surgeon · alive
- BGRemover MCP — Video Alpha Inspection io.github.j-river/bgremover · alive
- EditableImage MCP — Editable Draw.io Diagrams io.github.j-river/editableimage · alive
- SubtitlePop MCP — SRT & WebVTT Tools io.github.j-river/subtitlepop · alive
- IFC Viewer Online io.github.j03rul4nd/ifc-viewer-mcp · alive
- Code Assistant io.github.j0hanz/code-assistant · alive
- Code Lens io.github.j0hanz/code-lens · alive
Servers that mention mermaid or online.
- AutEng MCP - Markdown Publishing & Document Share Links ai.auteng/mcp · alive
- DiagramZu ai.diagramzu/mcp · needs auth
- Loci Labs Real-World Observations ai.loci-labs/real-world-observations · alive
- Line9 ai.line9/diagrams · alive
- Pechincha.ai ai.pechincha/deals · alive
- ai.tuteliq/mcp · needs auth
- ai.upriver/upriver · needs auth
- ai.smithery/hustcc-mcp-mermaid · not found
Badge for the README
The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.
A mail when this server changes
Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.
For the publisher
- The server answers initialize and tools/list. Nothing to fix.